Toolholder



Feb. 6, 1951 H. c. CLATFELTER TOOLHOLDER 2 Sheets-Sheet l lll'l' Filed May 29, 1948 INVENTOR. f/omekc 674%ZZ'66 BY fl/hl/yy 1951 H. c. CLATFELTER 7 2,540,568

TOOLHOLDER Filed May 29, 1948 r 2 Sheets-Sheet 2 all 3 INVENTOR. L i #wmc. CZaZfeZZ'e z.

E15 BY 4% Patented Feb. 6, 1951 TOOLHOLDER Homer 0. Clatfelter, Novi Township, Oakland County, Mich.

Application May 29,

2 Claims.

i This invention relates to improvements in toolholders for lathes, automatic machines and the like. It is an object of the invention to provide a toolholder which is relatively cheap and simple to manufacture, and which may be employed for supporting any one of a wide range of tools. Another object of the invention is to provide a toolholder including an apertured post split horizontal from the aperture to one ext e y, means extending through both split portions for Securing the post upon a rest, and other means also extending through both split portions for drawing the latter and opposite sides of the aperture toward one another to firmly engage the shank of a tool supporting member in the aperture.

- Further objects of the invention are to provide a toolholder wherein the tool supporting member and its shank, which is tubular are also split so that when the split portions of the post are drawn together to grip the shank the latter is also compressed to rigidly engage a tool in the supporting member; and wherein the shank of the tool supporting member is rotatable in the aperture when the means holding the shank immovable in the aperture is loosened to permit adjustment of the tool.

Having thus briefly stated some of the objects and advantages of the invention I will now describe it in detail with the aid of the accompanying drawings, in which:

Figure 1 shows a side View of the invention supporting a parting tool, Y

Figuer' 2 is an end view taken on the line 2-2 of Figure l, and

Figure 3 is a plan view thereof.

, Figure 4 is a section on the line 4-4 of Figure 3. V

Figure 5 is a front view of the tool supporting member,

Figure 6 is a side view thereof line 6-6 of Figure 5, and

Figures 7 and 8 are sections on the lines 1-4 and 8-8 respectively of Figure 6. 3 Figure 9 is an end view of a slightly form of toolholder, and

Figure 10 is a side view thereof;

Figures 11 to 13, inclusive, show a further taken on the modified modified form of my toolholderawherein the tool is held in the bore of the shank of the tool supr porting member; in Figure 11 a boring bar is shown mounted therein; in Figure 12 an adapter carrying a drill is mounted in the tubular shank; and in Figure 13 a drill is directly supported in the said shank. I

1948, Serial No. 30,029

1 Figure 14 is an end view of the modified form of tool supporting member shown in Fi ures 11 to 13, and

- Figure 15 is a section on the line l5--l5 Figure 14.

' Referring to the drawings, l designates a post having an aperture 2 formed horizontally therethrough adjacent oneextremity, and a slot 3 substantially in alignment with the axis of the aperture 2 which extends from the latter to the opposite extremity of the post, thereby dividing the latter for the major portion of its length into an upper portion 4 and a lower portion 5. Formed vertically through the upper portion 4 are two openings 6 and I so located that an imaginaryline drawn through their axes extends at right angles to the axis of the aperture 2. The opening 6, nearer the aperture 2 than the opening I, is of uniform diameter throughout its: length while the opening 1 is preferably counterbored from its upper extremity. Formed through the lower portion 5 of the post in alignment with the openings 6 and 1' are other openings 8 and 9 respectively. The opening 8, which is a clearance opening, is usually smaller than the opening 5, and the opening 9 is internally threaded:

Mounted in the opening 6 and having its lower" extremity resting upon the upper face of the lower portion 5 of the post is a bushing 10 through which a bolt 1! extends. The head of this bolt is usually located in the upper extremity of the opening 6, and in threaded engagement with the lower extremity of the bolt II is a nut Haformed to engage'a s1ot,' such as the T-slot A formed in a compound rest indicated at B. Consequently by tightening the bolt II the post -isheld immovable upon the rest B without drawing the=gupper and lower portions 4 and 5 ofthe post l together. The tool sup-- porting means includes a shank l5 which extendsthrough the aperture 2 and may be held immovable therein by the screw l2 which passes through the opening 1 and is in threaded engagement withthe opening 9. -The..counterbore at the upper '53 extremity of the opening 1 is provided to receive the head of the screw- 12. -v

In the embodiment jshown in Figures 1 to 10; the toolsupporting member includes a retainer l6 integral with and positioned on one extremity of the shank l5, and formed across the outer face of the retainer is a groove I! to receive a cutting tool 0, such as a parting tool shown in Figures 1 to 3, inclusive, or a tool bit as shown in Figures 9 and 10. In the construction shown in all the above mentioned views except Figures 9 and 1c 3 the shank I is tubular throughout its length and this tubular opening also extends through the retainer l6. Formed substantially diametrically through the tubular shank l5 from its extremity remote from the retainer [6, and terminating substantially flush with the rear of the said retainer, are slots I 8 which are disposed at right angles to the groove I1; and formed through the retainer "from the base of the" groove I! and parallel with opposite sides of the latter are other slots 19 which terminate a short distance from the extremity of the shank I5 remote from the retainer 16.

with one side of both the slots 19. Consequently when the shank I5 is inserted in the aperture 2 and the screw I2 is tightened not onlyare'thepost portions 4 and 5 drawn toward one anotherso that opposite sides of the aperture 2 firmly engage the shank l5, but the inward pressure exerted' ripen the periphery of the shank 15 causes the s'aid'shan'k to exert gripping action upon opposite sides of the tool C mounted bet'w'een opp'Osite-sides of the groove ll. And incidentally if a circular object, such as a tool sh-ank,'were in-' s'erted in'the'bore of the shank -5 the latter would exert' inward pressure around substantially the entire periphery of the said circular object so that the latter would be held immovable.

' 'Inthe modification shown in Figures 9 and the shank iii of the tool supporting member is solid so that while it is 'firmly engaged in the aperture 2' of the post when the screw l2'is' tight ened the spacing between opposite sides of the groove 1! (which -is deeper) is'not changed by manipulation of the'saidscrew. In this instance set screws 20 are threaded through the retainer f6 and extend into the groove ll to bear against one side of the tool'bit C and force the opposite side" of the'latter into binding engagement with the'opp'os'ite side of said groove. v

"In the modification shown in Figures 11 to 15, inclusive, the tool supporting member consists merely of a tubular shank a and the retainer is dispensed with since it would only be superfluous. The tubular shank 15d is again mounted in the aperture 2 in the post i, and'has similarly arranged aligned slots 18a and [9a therein extending from opposite extremities, so that when the screw 12 is tightened the bore-of the shank is contracted to grip the periphery of a tool extending therethrough. When the tool supporting member has a retainer integral with the shank, as in Figures 1 to 10', inclusive, the bore of the latter is usually of uniform diameter throughout its length, however when a tool is to be mounted therein the bore may be either straight or "taper'toaccommedate'the tool to be held therein. Figure 11 shows"a' boring bar D of: uniform diameter throughoutits'lengthmounted in a straight bored:

shankflfiafi In Figure 12 an adapter E having a'tapered' shank is shown mounted in one of my tubular shanks 15a the bore of whichis 'correspondingly tapered. The adapter in this case supports a drill F. Figure 13 showsa taper shank drill G directly supported in the tapered bore of one or myrubuiar "shanks I521;

"eWhei'i'thetool support ng member ce 'sists only or a'split tubular :shank l5a, ='in order to facili- Moreover it is frequently prefer-- able that one margin of the groove l'l coincidestate its removal from the aperture 2 of the post, the said shank is preferably longer than the aperture and projects from both extremities thereof. Moreover an annular recess 25 may be provided around the shank adjacent one extremity thereof for the same reason.

While in the foregoing the preferred embodiments of the invention have been described and shown, it is understood that other alterations and modifications may be made thereto provided they .fall within the scope of the appended claims.

What I claim is:

1. A toolholder including a post having a horizontal aperture formed therethrough adjacent one side thereof, said post being horizontally split from said aperture to its opposite side, the split portions of the post having aligned openings formed therethrough, a bolt extending through one pair of aligned openings having a nut on its underside for securing the postupon arest, a bushing extending between the head of tlie'bolt and the top of the lower splitportion through'tl'ie opening in the upper split portion of the post through which said boltextends to prevent said split portions being drawn together when the bolt" is tightened, a screw in a second pair of aligned openings in .threaded engagement with the openingin .the lower split portion through which it extends adapted to draw saidsplitportions and opposite sides of the aperture together, and a'tool supporting member including a shank, the latter extending through said aperture ,andbeing held immovable therein by said bolt. U v H v2. Artoolholder including a post having ahori; zontal aperture formed therethrough adjacent one side, the .post being split horizontally from the-aperture to itsopposite side,.the two split portions having vertically aligned openings there;

through, a fastening means including -a bolt {8X71 tending throughboth said Openings ha ling a top at the upper end anda nut at the lower end for securing the post upon a rest, a bushing in the opening in the upper split. portion around the up: perpart of the bolt and against the top of which the top of said bolt bears, said bushing bearing against the lower split portion for preventing the uppersplit'portion being drawndown toward the lower split portion'when said fastening means is, tightened, a tool supporting member in the post aperture, and means for drawing the split p01 tions of the post towardone another to hold the supporting member immovable. 4

HOMER c. CLA FE RJ REFERENCES CITED The following references are of record in the,

file of this patent:

UNITED sTATEs PATENTS 

